Eudonia ustiramis is a moth in the Crambidae family. It was described by Meyrick in 1931. It is found in New Zealand. The wingspan is about 16 mm. The forewings are grey, the costal and dorsal thirds irrorated with white. There is an irregular streak of black irroration beneath the cell from the base to the end. The hindwings are light grey. Adults have been recorded on wing in January.